Truck for drill and mining machines



Oct. 20, 1953 s. c. MOON TRUCK FOR DRILL AND MINING MACHINES I 5Sheets-Sheet 1 Filed Jan. 5, 1949 II/NVE/YTOE NG C Moon,

/A4 M; 1 ATT'Y. 5

NW NE Oct. 20, 1953 s; c. M OON 'TRUCK FOR DRILL-AND MINING MACHINESFiled Jan. 3, 1949 5 Sheets-Sheet 2 [NVE/V'TOE, STERLING C. Moon,

Oct. 20, 1953 s. c. MOON 2,656,152

TRUCK FOR DRILL AND MINING MACHINES 7 Filed Jan. 3, 1949 5 Sheets-Sheet'3 Jay. 5

fivvE/vToQ 5'TERLING C. Moon,

HTT Y.

Oct. 20, S. C. MOON E TRUCK FOR DRILL AND MINING MACHINES Filed Jan. 5,1949 5 Sheets-Sheet 4 l4 9 R vERsE?\ FORWARD U F, 85 FROM No l P M -TO0km. (o2 TANK) f/v VE/Y T 0/? STERLING C. MooN,

FROM H02 50 Oct. 20, 1953 s. c. MOON 2,656,152

TRUCK FOR DRILL AND MINING MACHINES Filed Jan. 3,. 1949 Sheets-Sheet 5[N VEN TOE; STERLING C. MOON,

HTT'Y Patented Oct. 20, 1953 TRUCK FOR DRILL AND lWININ G MACHINES-Sterling 0. Moon, Worthington, Ohio, assignor to The JeffreyManufacturing Company, a corporation of Ohio Application January 3,1949, Serial No. 68,963

6 Claims.

This invention relates to a truck designed particularly for use in anunderground coal mine and in one form adapted to support a removablemining machine and in another form adapted to support a drill mechanism.

An object of the invention is to provide a truck in which a pair oftraction wheels are driven by hydraulic motors and in which there is anelectric cable reel also driven by a hydraulic motor and a hydrauliccircuit or system.

A further object of the invention is to provide a truck with an improvedhydraulic circuit and to provide an improved hydraulic circuit, per se,in which two hydraulic pumps are provided, the

output of which is delivered to a pair of traction hydraulic motors anda cable reel hydraulic motor and in which the output of only one of thepumps is delivered to a drill mechanism mounted on said truck.

Still another object of the invention is to provide an improvedhydraulic circuit for controlling the operation of a pair of hydraulictraction motors and a cable reel motor.

Other objects of the invention will appear hereinafter, the novelfeatures and combinations being set forth in the appended claims.

In the accompanying drawings:

Fig. 1 is a side elevational view of a truck adapted to support aseparate mining machine and involving certain features of my invention;

Fig. 2 is a plan view of the truck of Fig. 1;

Fig. 3 is a plan view of the truck of Figs. 1 and 2, modified, however,to support a drilling mechanism which is illustrated as carried therey;

Fig. i is a side elevational view of the truck of Fig. 3;

Fig. 5 is a sectional view on the line 5-5 of Fig. 1 of the drawings,except as indicated hereinafter, and showing particularly the two speeddrive gearing from a rotary hydraulic traction motor to a wheel drivingsprocket;

Fig. 6 is an elevational view of a valve assembly and operatingmechanism therefor, with the valves shown in section;

Fig. '7 is a piping diagram of the system, with the drilling mechanism;and

Fig. 8 is a diagrammatic plan view of the truck Referring particularlyto Figs. 1 and 2 of the drawings, the truck includes a low generallyhorizontal elongated mainframe or body ill, the

front end of which is. supported by a pair of laterally spaced alignedtractionwheels H and ward portion of said body It.

and carried by the main frame It and also be neath and protected by afender I3 is a two speed power unit. The power unit for driving .thewheel 1! is designated M and the power unit for driving the wheel i2 isdesignated it. These power units are essentially duplicate in designexcept one is a right hand unit, the other a left hand unit.

Power unit 15 is illustrated in detail in Fig. 5 of the drawings and issubsequently described completely. Power unit [5 includes a main casingor housing [6 which is adapted to be removably but rigidly attached tothe main frame It in a position directly ahead of the wheel 12. Rigidlybut removably attached to the main casing or housing It is a transfercasing or housing !1 which supports a reversible rotary hydraulic motori8 which constitutes the traction motor for driving the wheel l2, saidmotor it being supplied with hydraulic fluid, as hereinafter described.

The rotor shaft of the reversible hydraulic motor I8 is provided with apinion It which drives a gear 2!] through a reach gear 25, all of saidgears being within the transfer casing l? and being accessible by virtueof a removable cover plate 22 provided for said transfer casing ll. Gear26 is keyed to a shaft 23 mounted on spaced anti-friction bearings, oneof which is in a neck of the transfer casing H which communicates withthe main casing it, the other being in a socket or recess in a removablecap of said main casing l6.

The shaft 23 is provided with an integral low speed gear 24 and haskeyed thereto a large high. Spaced from the shaft 23 and paralleltherewith is a driving shaft 26 which speed gear 25.

Splined to the shaft 26 for shifting movement along the axis thereofisa. shiftable double gear having a large low speed gear 29 and a smallhigh speed gear 30. As illustrated in the drawings, the two speedgearing provided by the gears 24 and 29 in the one instance and thegears 25 and 30 in the other instance, are in their neutral positionssince the composite gear 28, 3!! is positioned on the shaft 26 so thatthe gears thereof are out of mesh.

Cooperating with the composite gear 29, 3B is a shipper 3! which isrigidly attached to a shiftable guide rod 32 slidable axially incylindrical guides 33 and 3% provided in removable caps forming part ofthe main casing H3. The guide rod 32 is provided with three spacedperipheral grooves 35 which selectively cooperate with a spring and balldetent 36 which indicates selectively three positions of the two speedgearing, namely, low speed, neutral, and high speed, the parts beingillustrated in the neutral position in Fig. of the drawings,

By shifting the guide rod 32 upwardly, as viewed in Fig. 5 of thedrawings, the gears '24 and 29 will be brought into mesh, providing alow speed drive from the motor 1 3 to the sprocket 21. By shifting saidguide rod downwardly from the position illustrated in Fig. 5 a highspeed drive will be effected by meshing the gears 25 and 3B. Shifting ofthe guide rod 32 is efiected by a pivoted lever or arm 37 whichcooperates with a pin 38 on the shipper 3!, the lever or arm 31 beingcarried on a stub shaft 39 which is journaled in the end of the casing55 and is operated by a horizontal inwardly extending operating lever40.

In the interest of clearness, in Fig. "5 of the drawings the lever 37,shaft 39 "and lever Ml have been rotated 90 with respect to the otherparts illustrated, the actual physical relation "of the lever 45 to thecasing 16 being "illustrated in Fig. 2 of the drawings.

Referring to Figs. 1 and 2 of the drawings, it will be seen that thesprocket 21 of power unit It is connected by a chain 4| to a sprocket t2rigidly attached to the traction wheel l2. A similar chain and sprocketdrive is provided between the sprocket 27 of the power unit Hi and thewheel I I.

From the above description it is evident that a very compact two speeddrive is provided for each of the traction wheels ll and 12 from anindividual hydraulic motor. Furthermore, the power unit for each wheel,including the motor and speed reducing gearings, is located directlyahead of the wheel which it drives and is protected by the main frame,including the adjacent fender 13. This all contributes to a gooddistribution of weight, the location of the power units laterally of themain body carrying por tion of the truck, and the close positioning ofthe power unit, including the driving motor, to the traction wheel whichit drives. It also makes available considerable space rearwardly of thetraction wheels for other apparatus, some of which is describedhereinafter.

In the truck disclosed in Figs. 1 and 2 there is a pivoted platform 83which is pivoted on a horizontal transverse axis, at substantially itsmiddle, by means of aligned stub shafts '44 which are preferably carriedin a hollow tube welded rigid with the platform 43. The stub shafts "44are preferably welded to the tube and extend into bearing means in theadjacent side members of the main frame Ill. The platform as is held inthe position illustrated in Figs. 1 and 2 of the drawings by a pair ofr'ele'asable latching pins 45 carried by the main frame it adjacent thefront end thereof, which pins 45 project beneath the upper end of theplatform 53 adjacent opposite sides thereof. Latching pins 55 may bewithdrawn to permit the front end of the platform 43 to drop down ontothe mine floor so that a mining machine, such as a shortwall or longwalltype of machine, may be dragged upon the platform 23 by operating itscable which may be hooked at one end to a portion of the main frame I B.

Toward the rear end of the frame ID is a transversely extending steeringwheel axle :38 having steerable wheels ll and M3 on opposite sidesthereof which are interconnected in a standard manner and operated by asteering wheel 49 adjacent an operators platform 50 which is adjacentthe rear right-hand side of the main frame is, The axle 56 is pivotallyattached to the main frame ID at its center along a horizontallongitudinally extending axis to'provide a three-point suspension forthe main frame in in "cooperation with the front wheels H and I2. Thewheels 6! and 48 are received in open pockets and normally are withinthe lateral confines of the main frame Ill.

Adjacent the operators platform 58 and in the central rear portion ofthe main frame ii) there is a tank 5! for hydraulic fluid of thehydraulic system described hereinafter, to the rear of which there is anelectric cable reel 52 which is driven through a chain and sprocketdrive from a'reversiblehydraulic motor 5 1.

Simultaneous control for the two speed reduction gearing mechanisms l4and I5 is provided by means of a pair of longitudinally extending rods55, one on each side of the upstanding members of the main frame It),the forward ends of which rods are pivotally attached to the previouslydescribed levers '60, and the rearward ends of which are attached tocrank arms 56 which are keyed to a horizontal transversely extendingrock shaft 5'! which has an operating lever 58 adjacent one side forrocking the shaft 51 and simultaneously and similarly shifting the gearsof the power units i4 and I 5.

On one side of the upstanding members of the main frame Hi and below oneof the fenders l3 and between the front traction wheel l2 and the rearsteering wheel 8, there is an electric motor 59 which drives a pair ofhydraulic pumps 0 and 6 l From the above description it is evident thata compact flexible truck has been provided, in which there is a pair offront traction wheels, one adjacent each side of the body or main frameand near the front thereof. Each wheel is individually driven from areversible rotary hydraulic motor through an individual two speed powertransmission mechanism. The two power transmission mechanisms aresimultaneously controlled from the rear of the unit by apppropriatecontrol mechanism. Near the rear end but forward of the operatcr'"sstation, which is adjacent the rearmost portion thereof and at one side,there is a pair of steerable wheels which support the rear end of the*body and provide for steering thereof. A hydraulically driven rotaryelectric cable reel is also provided adjacent the rear end of the bodyand substantially centrally't-hereof.

The above described drive mechanism for the truck is claimed in mydivisional application, Serial No. 363,434, filed June .23., 1953, for"a Truck Including Improved Dr'ive Means.

Attention is now directed to Figs. 3 and 4 of the drawings where amodified form of truck is disclosed, it being understood that except forsuch differences as are obvious or specifically mentioned, it followsthe disclosure of the truck in Figs. 1 and 2 above described.

In the truck disclosed in Figs. 3 and 4 the platform 43 has beenentirely eliminated, and the main frame or body E0 carries a rigidturntable 62 upon which the boom 63 of a coal drilling mechanism 64 ismounted for swinging movement about a vertical axis. The detailedconstruction of the drill mechanism 65, per se, is not a feature of theinstant invention and may follow, for example, the construction of thedrill mechanism disclosed and claimed in the application of John S.Beltz, Serial No. 769,358, and now abandoned, entitled Power Driven andControlled Coal Mine Drilling Machine, filed August 19, 1947.

As hereinafter pointed out, the principal significance, insofar as thepresent invention is concerned, is in the hydraulic circuit wherein thehydraulic circuit of the coal drilling mechanism is intimately involvedin applicants novel hydraulic circuit in one form thereof.

Attention is now directed particularly to Fig. 6 of the drawings and tothe construction of a 7 multiple valve unit, generally designated 65,

which forms an important feature of my invention and provides novelhydraulic controls. Ad-. jacent the operators platform 55] there is asystem of levers 8.6 which may be operated to shift an upstandinglinkage 61. By reference to Figs. 1, 2, 3 and 4 it may be seen that thelevers 66 are, adapted to be operated from either end of the operatorsplatform and in the arrangement of Figs. 3 and 4 are also adapted to beoperated by a forwardly extending rod 68, which may be grasped by anoperator, adjacent the front of truck, who is operating the variouscontrol valves of the drill mechanism 64. Operation of any of theseseveral levers of the mechanism 66 may be employed to shift theupstanding linkage 61 in either of reverse directions from its neutralposition illustrated in Fig. 6 of the drawings.

When linkage 67 is moved upward, the associated truck is caused totravel rearwardly and when said linkage is moved down it is caused totravel forwardly. The linkage mechanism 61 is interconnected with threebell crank levers 69, 10 and H which are pivoted to the main frame andeach of which is connected to an individual spool, or what may broadlybe considered an individual valve of the valve unit 65; the spools oroperating mechanisms associated with the levers 69, It and TI beingdesignated 12, 13 and M, respectively. In effect, each of these spoolsl2, l3 and M represents an individual reversely operable control valvewhich while the essential characteristics are of standard design,nevertheless is designed particularly for the particular hydrauliccircuit here involved.

Of particular importance is the fact that while the levers $9 and H are.connected to partake of reverse movement with the linkage El, there is alost-motion connection-provided by an elongated slot '85, between thelever is and the linkage st so that spool it is moved only in one,direction from its normal position; that is, it is moved inwardly whenthe linkage 61 is moved upwardly. It does not move from its normalposition when the linkage 6'! moves downwardly. Stated another way, whenlinkage it? moves upwardly, all three of the spools l2, l3 and I l aremoved inwardly or to the right, as. viewed in 6. Fig. 6 of the drawings.When the linkage 61 is moved downwardly, only spools l2 and 14 areactuated and they move out or to the left, as viewed in said Fig. 6.Each of these spools is provided with a self-centering spring ofgenerally standard construction.

The valve unit 65, in the preferred and complete embodiment, is built upby combining three individual valve blocks or casings. The first valveis designated '16 and constitutes a standard form of pressure reliefvalve. Below the pressure relief valve 76 is the block 11 of a doublevalve which receives the spools l2 and i3, and for practical purposesthis constitutes two individual control valves. Below the double block11 is a block :8 which receives the aforementioned spool 14.

As hereinafter described, when the hydraulic drill is omitted the block18 and the spool 14, together with the actuating mechanism therefor,may, if desired, be completely eliminated. However, it may, if desired,still be employed, as pointed out hereinafter. It may be stated at thistime that in the hydraulic circuit illustrated in Fig. 8 the block 18and spool is are completely eliminated. In the hydraulic circuit of Fig.7 this block 78 and spool 15 are involved and they may be involved eventhough the hydraulic drill is eliminated.

The operation of the several valves of the valve unit 65 can best beexplained in connection with the three operating conditions thereof inconjunction with the hydraulic circuit of Fig. 7. Assuming that theelectric motor 59 is running and driving the two pumps 69 and El, itwill be seen that pump 65; derives hydraulic fluid from the tank 51through a filter over a feed pipe or conduit 19 and delivers it over apressure pipe or conduit 8?] to a block 8i attached to the block 18. Inthis regard it may be noted that the relative positions of the valvesare reversed in Fig. 7 as compared with Fig. 6; that is, block i8 is ontop and block '5'! is on the bottom in Fig.

' '7, while the reverse condition applies to Fig. 6.

A pressure relief valve 82 is interposed in the conduit the fluidnormally flowing through it without effect. A high pressure condition,however, will cause the fluid to spill over to tank 5| by way of tankpipe or conduit 83.

Pump El derives fluid from the tank 5! through a filter by way of feedpipe or corn duit 84 and delivers its output fluid under pressure topipe or conduit 35 which leads to the pressure relief valve 76. Thehydraulic fluid is preferably oil or the like.

With the valves or spools l2, l3 and TM in their normal or neutralpositions, as illustrated in Fig. 6 of the drawings, the truck will bestanding still and be locked in position. This will be a normalcondition under which the drill mechanism 64 will be operated wheneverit is present on the truck. Under these conditions the output of thepump 58 flowing through the conduit 89 and block ti will enter thebifurcated passageway 8G in the block it and will flow through thecentral cylindrical bore in said block to a central chamber 3'5 which isconnected by a fitting to a pipe or conduit 88 which is the pressurelineleading to the multiple control valve designated I39 which is the maincontrol valve for the hydraulic drill mechanism Ed, said valve I39corresponding with the valve its of the Beltz application, Serial No.769,358, above identified. In other words, under these conditions pumptdsupplies the hydraulic fluid for 7. operating one or more or thehydraulic control mechanisms of the drill cs. 01 which there are anumber, as disclosed in detail in said Beltz application.

Tank conduit or pipe 83 also extends to valve I39, providing a returntor the fluid from said hydraulic motors or the drill mechanism by wayof valve 139 to tank 51. If the drill mechanism is eliminated, the valveof block 38 may be eliminated, together with all or its associatedmechanism and this .condition is illustrated the diagrammatic pipingdiagram of Fig. 8 of the drawings which follows the piping diagram ofFig. 7, except for obvious diiierences or those pointed out hereinafter.Onthe other hand, even if the drill mechanism is eliminated, the block16 and associated mechanism may, if desired, be retained. If it isretained, the pipe or conduit 88 is merely connected to tank 5i andunder such conditions the circuit above described would cause the pump5i merely to by-pass freely to tank 5 4.

Under the assumed conditions, namely, with the valves in neutral, theoutput of pump 61 is delivered over conduit '85 to pressure relief valveit, through which it freely flows, as evident by the provision of thethrough passageway seen in Fig. 6 of the drawings, the fluid beingconnected to a central bifurcated passageway as in the block Ti. Fromthis passageway 85 the hydraulic fluid will flow to a central chamber asin said lock it, which chamber so is permanently connested by pipe orconduit d! to tank 5!. This provides a no-load by-pass for the pump t9.Should a high pressure develop in the line 3Z1. the standard pressurerelief valve it will openate in a well known manner to interconnect themain central through passageway to a spillage passageway $32 whichcommunicates with a passageway 83 in the block ll. Block H on the backside is provided with a passageway 96, indicated by dotted lines, whichis in constant communication with the central chamber '95 and with alarge end chamber $55.

Thus if pressure relief valve 16 operates it connects the pressure lineor conduit 85 to tank by way of passageways 92, $3 and 94 to chamber 96which is directly connected by conduit 9| to tank.

When the truck is trammed forward it is, of course, evident that thecable reel will have to rotate to pay out cable, unless there is areasonable amount of slack in it. In this operation the two tractionmotors of the power units 14 and 15 are supplied with hydraulic fluid inparallel and the cable reel operating hydraulic motor 54 is merelyby-passed; that is, its input and output conduits are connectedtogether, thus allowing it to float and allowing the pull on the cableto rotate the reel as required. This is efiected by actuating any one ofthe control levers E5 to push the linkage t1 downward, which actuatesvalves or spools 12 and 14 by pulling them out or moving them to theleft, without efiecting any actuation of valve or spool I3.

Under these conditions, the hydraulic fluid from the pump 50 isdelivered, as above described, over pressure conduit 86 to thebifurcated passageway 86, from which it is now connected to a chamber 96by the lands on the spool 14, which chamber 96 is connected by conduit9! (see Fig. 7) to the two reversible rotary hydraulic motors of thepower units M and I5 connecting them in parallel; the return line fromsaid traction motors being by way of pipe or conduit 98.

Under the conditions just described. the conduit 9! is, of course, thepressure conduit which delivers hydraulic fluid to the two tractionmeters of the power units It and 1-5 in parallel. This fluid is not onlydelivered to said conduit 91 from the pump 50, above described, but alsosimultaneously delivered thereto from the pump -6 i. This path is frompum :Gl by way of pressure conduit through relief valve 16 into thebifurcated passage B9 of valve 12, thence into passageway 99 which isnow in communication therewith, since the spool 12 is moved to the left,as viewediin Fig. 6. Passageway 9:9 is connected with the centralchamber I00 associated with the spool or valve 13 under theseconditions, since it is in its neutral position Chamber IUD ispermanently and directly connected to a branch of conduit .91, asclearly illustrated in Fig. 6 of the drawings. Thus both of the pumps 50and B! are connected in parallel and the combined output is delivered toconduit 91, including all the branches thereof, which connects the twotraction motors in parallel. Conduit :98, including all branches,provides the return path for the hydraulic fluid from the tractionmotors of power units 14 and 15. One of these branches of conduit 98 isconnected to chamber Ill! associated with spool E2 which with the spoolmoved to the left, as viewed in Fig. 6, as assumed, is now incommunication with the end chamber which, as above described, ispermanently connected to tank by means of passageway 94, central chamber.99 and conduit 9 I.

At the same time the lower branch of return conduit t8 is also connectedto tank through the blocks H and 18, since chamber m2, associated withspool M, is now connected to passageway I83 which in turn communicateswith passageway lflfi in block ll, and said passageway I64 being now incommunication with end chamber 95.

At the same time the reversible hydraulic motor 55 for controlling thecable reel 52 is bypassed. In other words, its two conduits areconnected together to allow it to rotate freely. This is effected byspool 73 which is in its neutral position and in which position itaccomplishes the above result.

To this end, there is a pair of spaced chambers I95 and me associatedwith the spool 13, which passageways are permanently interconnected by apassageway on the back of the block Tl, said passageway being indicatedby the dotted lines till. Chamber IE5 is permanently connected to aconduit 188, and chamber 106 is permanently connected to conduit I89.Conduits H38 and 189 are the output and input conduits respectively forthe cable reel driving motor 5 3.

When the machine is reversed, or travels rearwardly, it is, of course,necessary to supply power to the reel motor 54 so as to reel in thecable. This is effected automatically and simultaneously with theactuation of the traction motors of the power units It and 15 to drivethe truck rear- Wardly. To effect this operation the linkage mechanism61 is lifted upward by any one of the operating mechanisms 66, underwhich conditions all three of the spools 12, 73 and M are actuated tothe right, as viewed in Fig. 6 of the drawings.

Under these conditions, hydraulic fluid from the pump Bil deliveredthrough the conduit 8!] flows through the bifurcated passageway 86, andthe chamber 162 which, as previously described, is connected to conduit98. Conduit 98, as above described, connects the two motors of the powerunits M and 15 in parallel, this now being the pressure conduit insteadof the return conduit.

power units I4 and I5 are now provided by conduit 91 and the variousbranches of it.

As above described, the conduit 9:? leads to chamber I associated withspool I3 which is now in communication with chamber I86 under thecontrol of said spool I3. Chamber I55, as above described, is connectedwith conduit I09 which leads to one side of the reel operating motor 54,delivering hydraulic fluid which is first passed through the twotraction motors of power units I4 and It in parallel to said reeloperating motor 54 at a reduced pressure, driving it in such a directionas to tend to reel in the cable associated therewith. The normal returnline from the motor 54 is by way of conduit Ills which, as previouslydescribed, is permanently connected to chamber I05 which is now incommunication with the passageway 93 which, as above mentioned, is inpermanent communication with tank passageway 89 and tank chamber 90 byway of conduit ill.

The motor 54 is therefore connected in series with the two motors ofunits I i and is which as a pair are connected in parallel. The quantityof hydraulic fluid delivered to the motor is such as to tend to rotatethe cable reel at a higher rate than is normally required to reel in thecable. This is desirable to insure that the cable will be adequatelyreeled in. However, to prevent breaking of the cable a pressure reliefvalve IIIl interconnects the conduits we and I09, it being controlled bythe pressure in said conduit I09. It is set at'a relatively lowpressure, such as one hundred and fifty pounds per square inch, so'thatwhenever there is any appreciable tension on the cable q associated withthe reel 52, this pressure will be developed in line I09 and the excessfluid by-passed by valve III! to the tank line Iilll.

Associated with the relief valve I I0 I also preferably provide ableeder valve II I which is con- In normal nected to tank 5| by aconduit II2. operation the bleeder valve III will be closed and pressurerelief valve II I! will operate as above described. The function of thisbleeder valve is to disable the motor 54 completely which sometimes isdesirable when the truck is adjacent a working face and is carrying thedrilling mechanism 64 and the operator wishes to jockey the truck backand forth to position the drill, during which time he does not desire totake up the slack in the cable but merely wishes it to lie on the floor.When the bleeder valve I I I is open, it effectively opens the by-passvalve Hi) so that it will freely by-pass any fluid de livered to conduitI09, delivering said fluid through the valve I It to tank conduit I08.

The hydraulic circuit of Fig. 8 differs only slightly from that abovedescribed. In the first place, of course, the hydraulically operateddrill 64 has been eliminated. Consequently there are no conduitsprovided for such a device. In this system the block I8 and associatedmechanism, including the spool I4 and bell crank H, are also eliminated.This calls for the principal difference between this system and that ofFig.

iii)

- duit 98.

I. In this system the output of each pump 66 and IN is delivered overconduits and to a junction block H3 where the hydraulic fluid iscombined and delivered to the previously described pressure relief valveI6. The block TI is the same in the system of Fig. 8 as in the system ofFig. 7, as are the associated spools I2 and i3 and the actuating meanstherefor.

It may also be noted that in Fig. 8 leakage conduits II 4- for theseveral motors have been illustrated, by which leakage is conducted tothe tank 5|. In. addition, the pressure relief valve 82 has beeneliminated, but a pressure relief valve II 5 is interposed in conduit97, and a pressure relief valve H6 is interposed in con- Spillage fromthese relief valves is, of'course, connected totank over an obvious lineor conduit.

Obviously those skilled in the art may make various changes in thedetails and arrangement of parts without departing from the spirit andscope of the invention as defined by the claims hereto appended, andapplicant therefore wishes not to be restricted to the preciseconstruction herein disclosed.

Having thus described and shown an embodiment of the invention, what itis desired to secure by Letters Patent of the United States is:

1. A truck mounted drill including a frame, means for driving said truckincluding a pair of hydraulic traction motors, an electric cable reeldriving motor, a drill on said frame having a hydraulic operating motor,a pair of power driven hydraulic pumps, a hydraulic circuitinterconposition when moved in one direction from neutral and toadiust-only twoof said valve members when moved in a reverse directionfrom neutral,

said lever mechanism when moved in said one direction operating saidthree valves to connect the output of both said pumps to said twotraction motors, and to connect the output of said two traction motorsto said cable reel driving motor; said lever mechanism when moved insaid reverse direction operating said two valves to connect the outputof both pumps to said two traction motors, and to provide a by-pass forthe cable reel driving motor, said valves operating when they and saidlever mechanism are in their neutral positions to by-pass the output ofone of said pumps and connect the output of the other pump to said drilloperating motor.

2. A truck including a frame, means for drivsaid truck including a pairof hydraulic traction motors, an electric cable reel driving motor,

a pair of power driven hydraulic pumps, a hydraulic circuitinterconnecting said pumps and motors including three adjustable valvemembers, means biasing said valve members to neutral position whereinthe output of both pumps is Icy-passed, and reversely operable levermechanism connected to adjust all three of said valve members to oneoperating position when moved in one direction from neutral and toadjust only two of said valve members when moved in a reverse directionfrom neutral, said lever mechanisrn when moved in said one directionoperating said three valves to connect the output of both said pumps tosaid two traction motors, and to connect the output of said two tractionmotors to said. cable reel driving: motor; said lever mechanism whenmoved in said; reverse direction operating said two valves to connecttheoutput of both; pumps to said two traction motors, to provide aIcy-pass. for thecable reel driving. motor.

3.-.. A hydraulic circuit includmg. a. pair of re.- versible rotaryhydraulia motors, athird h y;- draulic motor, a fourth hydraulic motor,a pair oi power driven pumps, a hydraulic circuit.- interconnecting saidpumps and said. motors includin a plurality of control valves at leastsome; of which have: neutral and reverse operating positions, andoperating: means for said valves operable to adjust all of them. whenoperated in one direction from neutral and operable to adjust less thanall oi them when. operated in a reverse direction from neutral, saidvalves being operable in said one direction to connect the output ofboth said. pumps to said pair oi reversible rotary hydraulic motors, andto connect the output of said pair oi rotary hydraulic motors to saidthird motor; said valves being operable in said reverse direction toconnect the output of both said pumps reversely to said pair ofreversible rotary hydraulic motors, and to prov de a by-pass for thethird motor; said valves operating when in neutral to by-pass theoutpu-tof one oi said pumpsand connect the output of the other pump to saidfourth hydraulic motor.

4- A hydrauliccircuit including a first rotary hydraulic motor, a secondrotary hydraulic motor, a pump, a hydraulic circuit interconnecting saidpump and said motors, and a pair of control valves in said circuit, oneof said valves having a neutral position and reverse operating,positions, the other of said valves having a neutral position and.- oneoperating position, said one valve being constructed to provide aby-pass for said pump when it is in its. neutral position, said twovalves cooperating when said one valve is moved to one operatingposition and. the other valve is neutral to connect, said first rotaryhydraulic motor in series with said pump and to provide a by-pass forsaid second rotary hydraulic motor, said two valves. also cooperatingwhen said one valve is reversely operated and the other valve isoperated from its neutral position to connect both said rotary hydraulicmotors in series.

51 A hydraulic circuit including a pair of power driven pumps, a firsthydraulic motor, a second hydraulic motor, a third hydraulic motor, anda hydraulic circuit interconnecting said pumps and said motors, saidhydraulic circuit having three adjustable valves therein all of whichhave a normal position, two of which have reversely operating positionsand one of which has one operating position, one of said reverselyoperable valves providing a by-pass for an individual one of said pairof pumps when in its neutral position, the other connecting the otherpump to said third hydraulic. motor, said two reversely operable valveswhen operated one operating position cooperating with the third valve:to connect. both of said pumps to said first hydraulic motor and to;provide a by-pass, for said second hydraulic motor, said two valves;when operated in the reverse operating position. together with theoperation. of said third: valve to its; operating position reverselyconnecting both of said: pumps. to said first hydraulic motor and withsaid second hydraulic motor;

(is Ahydranlio circuit: including a pair of power driven pumps, a first:hydraulic motor, a second hydraulic, motor, and, a hydraulic. circuitinterconnecting saicl pumps and said motors, said hydraulic.v circuitthree adjustable valves therein all of which have. an normal position,two of which have reversely operating positions and one. of which hasone' operating position, each of said. reversely' operable valves.providing a Icy-pass tor an, individual one of said pair of pumps whenit is: in its neutral position, said two reversely operable valves whenoperated one operating msition. cooperating with the: third valve to.conmeet both of said pumps to said first hydraulic motor and to providea Ely-pass for said second hydraulic motor, said two valves when,operated in the reverse operating: position together with the operationof said third. valve: to. its operating position reversely connectingboth of said pumps to said firsthydraulic motor and with said secondhydraulic motor.

STERLING C. MOON.

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